Windows 10 minimizing any games automatically at random times

Hi,

Since I installed Windows 10, all my games minimize at random times, I don't have anything else open. It happens with Steam games, as well as games not in steam, like Guild Wars 2 for example. It is so annoying, sometimes I am playing PvP tournament and the game minimize :(

This is happening in all games that I have installed right now:

-Terraria (steam)

-MKX (steam)

-Guild Wars 2

Also I found out that is not happening just in games, sometimes while I am browsing the internet too. I use Chrome to browse.

Did some research on the internet and I found some solutions, but none did work for me. What I did so far and didn't work:

-Disabled Internet Explorer 11 (Edge?).

-Set my Nvidia GPU to  single display performance. 

-Deactivated Windows Defender.

-Deactivated OneDrive.

My previous version of windows was 8.1, and I never had this issue before. It is only happening since I upgraded to windows 10. Also, to make it clear, the installation was clean, only files/documents were saved from 8.1. to 10. The rest I installed my self, like steam, the games I mentioned above and my GPU drivers.

Please help.